1)they gain huge internal satisfaction from their work; 2)they are more loyal to
their profession than their employers; 3)they need to constantly update their knowledge to be consistent
with the professional development; 4)they throw themselves into the work, that is they don't consider
workweek as working 5-8 hours a day and working 5 days a week; 5)they generally have higher payoff
and hope having more freedom and power of decision, meanwhile they value the support very much.